import sun.awt.image.ImageWatched;

import java.lang.reflect.Array;
import java.util.*;

public class Test1 {
    public static void main(String[] args) {
        System.out.println(8 >> 1);
        Stack<Integer> stack = new Stack<>();
        stack.push(1);
        Queue<Integer>queue=new LinkedList<>();
    }
    public static void main1(String[] args) {
        Solution solution=new Solution();
        int [][] nums={{1,   4,  7, 11, 15},{2,   5,  8, 12, 19},{3,   6,  9, 16, 22}, {10, 13, 14, 17, 24}, {18, 21, 23, 26, 30}};
        solution.findNumberIn2DArray(nums,5);
        System.out.println("aa");
        String s="hello";
        char ret=s.charAt(0);
        System.out.println(ret);
        LinkedList<Integer>list=new LinkedList<>();
    }
}
